7 days advance cancellation mandatory for all weekday events and 90 days notice for any weekend events. A failure to comply may result in forfeiture of deposit.

For testing and tuning purposes. Current W.S.I.R. membership for driver is acceptable.

For all other uses such as commercial filming, ride and drives or production car development, a $5 million combined single limit certificate of insurance is required, listing required parties as "Willow Springs Raceway as additional insured" and date of event, unless insurance is a blanket policy.